问题描述
为什么age()的设置器中未执行if语句?它应返回“年龄必须是数字”;
get语句有效,但set语句无效。
class Player {
constructor(name,age,position) {
this._name = name;
this._age = age;
this._position = position;
}
set age(value){
if(value.isNaN()) {
return "Age must be a number";
} else {
return this._age;
}
}
get name() {
return this._name;
}
get age() {
if(typeof this._age === "number") {
return this._age;
}else{
return "Cant fetch players age"
}
}
get position() {
return this._position;
}
};
const test = new Player("Peter","38","Forward")
console.log(test.age)
解决方法
您的构造函数应调用setter而不是实例变量:
class Player {
constructor(name,age,position) {
this._name = name;
this.age = age; //call setter
this._position = position;
}
...